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自分の環境で確認していないんだけどHaskell Reportによれば、自分自身のモジュール名も参照してエクスポートリストに入れられる：

A module can name its own local definitions in its export list using its own name in the “module M”
syntax, because a local declaration brings into scope both a qualified and unqualified name (Section
5.5.1). For example:

　　module Mod1( module Mod1, module Mod2 ) where
　　import Mod2
　　import Mod3

Here module Mod1 exports all local definitions as well as those imported from Mod2 but not those
imported from Mod3.

http://www.cse.iitk.ac.in/users/karkare/courses/2010/cs653/Papers/haskell2010.pdf
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